Cooling apparatus for reciprocating pistons



P l o. SIMMEN 1,852,861

COOLING APPARATUS FOR RECIPROCATING PISTONS Filed March 27, 1931 INVENTU 6%,

Patented: Apr. 5,

ST AT ESP car es;

osoee srrvrnrnn, or nannomswirznnnnum, nssrenoit 510 T rinuoesnnznn FRERES SOCIE'IE ANONYME, or wmrnarnun; swirznnnnnn COOLING APPARATUS r03 itnoirnocn'r rrorisrons Application filed. March 27, 1931, Serial No. 525,764, and in SizritzerlandJune 7,1930.

This invention relates to cooling apparatus for reciprocating P13130115. of; internal combustion engines and of the kind in which liquid cooling medium is delivered from a= 5 fixed nozzle in the form of a jet parallel to the path of the piston and enters a receiving orifice or pipe carried by the piston or a member secured thereto and communlcating with the interior :of the piston.

I t C type, owing to the inertia of the cooling medium which reciprocates with the p ston, this cooling medium tends at certain parts of the stroke toflow back through the or fice and thereby oauseback pressure on the et issuing from the nozzle, and the present invention has for its object to provide improved apparatus by which this back pressure Wlll be reduced.

According to this inventlon the receiv ng orifice or pipe communicates with the interior of the piston through an intermediate chamber containing air, whereby pressure 1mpulses or surges in the liquid carried in the reciprocating part of the system and tending to cause flow of liquid towards the fixed nozzle are damped and back pressure on the et thus reduced. T

Conveniently the intermediate chamber carries the receiving pipe and is arranged 1n that part of the system which reciprocates with the piston, while a non-return valve is preferably'provided to prevent returnfiow of the liquid from the interior of the piston back into therchamber.

. Two constructions according to the invention are illustrated diagrammatically by way of example in the accompanying drawings as applied to a vertical double acting internal combustion engine.

In thesedrawings, Fig. 1 is an'end elevation, partly 1n section of the improved engine, Fig. 2 is a fragmentary, vertical, sectional 45 detail of Fig. 1.

The engine comprises a cylinder a, a water cooled piston b, apiston rod 10 and a crosshead (ZQ The crosshead is connected to the crankshaft f by a'connecting rod e, and the S engine is supportedon a frame g.

Hitherto, in cooling apparatus of this The cooling water supplied through a pipe 7L issues'from a nozzle in .the form of a jet 11 parallel to the path of the piston" andenters a receiving pipe Z telescopically movable within :anouter-tube o having an overflow or 5 discharge pipe p. The pipe-Z. is rigidlyconnected to and COlTllllLllllCfltQSWltll a chamber m containingairand carried onthe crosshead (Z, this chamber communicating through a non-returnvalve a, a pipe 7: and a passage is 0 I impulses thus produced so that the intensity of back pressure impulses which would otherwise result on the jet z is reduced and consefliquent loss of cooling medium avoided. The non-return valve it serves to prevent the return of liquid from the interior of the piston to the chamber m and thus assist the benev ficial actionof the air in the chamber m.

I claim: 7

1. In an internal combustion engine the combination with a reciprocating piston, of a fixed nozzle adapted to deliver a cooling medium in theform of a ct parallel to the path 85 of the piston, of a jet receiving orifice connected to the piston by a pipe communicating with the interior of'the piston and of achamber containing air in the passage through which the cooling medium flows from the re- 96 ceiving orifice to the piston.

2. In an internal combustion engine the combination with a reciprocating piston, of a fixed nozzle adapted to deliver a cooling medium in the form of a jet parallel to the path of the piston, of a jet receiving orifice connected to the piston by a pipe communicat ing with the interior of the piston and of a chamber containing-s air. in the passage through which the cooling medium flows from 00 the receiving orifice to the piston, said air chamber being arranged in a part of the system reciprocating with the piston.

3. In an internal combustion engine the combination with a reciprocating piston, of a fixed nozzle adapted to deliver a cooling medium in the form of a jet parallel to the path of the piston, of a jet receiving orifice connected to the piston by a pipe communicating with the interior of the piston and of a chamber containing air in the passage through which the cooling medium flows from the receiving orifice to the piston, a nonreturn valve being provided to prevent flow of the liquid from the interior of the piston back into the air chamber.

4. In an internal combustion engine the combination with a reciprocating piston, of a fixed nozzle adapted to deliver a cooling medium in the form of a jet parallel to the path of the piston, of a jet receiving orifice connected to the piston by a pipe communicating with the interior of the piston and of a chamber containing air in the passage through which the cooling medium flows from the receiving orifice to the piston, the receiving orifice being carried by the air chamber.

In testimony whereof I have aflixed my sig nature.

OSCAR SIMMEN. 

